Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It does disclose meaningful behavioral traits: a one-free-registration-per-operator quota, $0.01/hold x402 pricing, and fleet plan inclusion, which is real value beyond the schema. However, it says nothing about what the hold actually does to the resource (exclusivity, duration, reversibility) or side effects of registration.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core action and compressed into a single sentence plus a pricing parenthetical; no filler. The dense pricing clause is information-rich but slightly crowds out more essential invocation detail.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a mutation tool with no annotations, no output schema, 7 parameters at 0% schema coverage, and a nested 'state' object, the description is far too thin. It omits the effect of holding, payment flow for x_payment, the structure of state, and any error/permission behavior.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% across 7 parameters, so the description must compensate, but it only re-lists parameter names ('Requires api_token, agent, resource_class, task, budget; optional state, x_payment') without explaining meaning, format, or units (e.g., what budget is denominated in, what x_payment carries). Naming params already visible in the schema adds little.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb+resource: 'Register a hold on a pooled resource.' This is clearly distinguishable from sibling actions (release, query, evaluate, account), though the description never explicitly names a sibling to contrast with.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No when-to-use or when-not-to-use guidance is given, and no alternative sibling (e.g., demurrage_evaluate_hold or demurrage_query_hold) is named as the path for other cases. The pricing/quota note hints at cost considerations but is not usage routing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.